package com.beanu.audiphones;

import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioRecord;
import android.media.AudioTrack;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.Toast;

public class Audi extends Activity {
    /** Called when the activity is first created. */
   Button btnRecord, btnStop, btnExit;   
   SeekBar skbVolume;//调节音量   
   boolean isRecording = false;//是否录放的标记   
   static final int frequency = 44100;   
   static final int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_MONO;   
   static final int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;   
   int recBufSize,playBufSize;   
   AudioRecord audioRecord;   
   AudioTrack audioTrack;   
	
	
	
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setTitle("助听器");   
        recBufSize = AudioRecord.getMinBufferSize(frequency,   
                channelConfiguration, audioEncoding);   
  
        playBufSize=AudioTrack.getMinBufferSize(frequency,   
                channelConfiguration, audioEncoding);   
        // -----------------------------------------   
        audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency,   
                channelConfiguration, audioEncoding, recBufSize);   
  
        audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,   
                channelConfiguration, audioEncoding,   
                playBufSize, AudioTrack.MODE_STREAM);   
        //------------------------------------------   
        btnRecord = (Button) this.findViewById(R.id.btnRecord);   
        btnRecord.setOnClickListener(new ClickEvent());   
        btnStop = (Button) this.findViewById(R.id.btnStop);   
        btnStop.setOnClickListener(new ClickEvent());   
        btnExit = (Button) this.findViewById(R.id.btnExit);   
        btnExit.setOnClickListener(new ClickEvent());   
        skbVolume=(SeekBar)this.findViewById(R.id.skbVolume);   
        skbVolume.setMax(100);//音量调节的极限   
        skbVolume.setProgress(70);//设置seekbar的位置值   
        audioTrack.setStereoVolume(0.7f, 0.7f);//设置当前音量大小   
        skbVolume.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {   
               
            @Override  
            public void onStopTrackingTouch(SeekBar seekBar) {   
                float vol=(float)(seekBar.getProgress())/(float)(seekBar.getMax());   
                audioTrack.setStereoVolume(vol, vol);//设置音量   
            }   
               
            @Override  
            public void onStartTrackingTouch(SeekBar seekBar) {                    
            }   
               
            @Override  
            public void onProgressChanged(SeekBar seekBar, int progress,   
                    boolean fromUser) {      
            }   
        });   
    }
	
	@Override  
    protected void onDestroy() {   
        super.onDestroy();   
        android.os.Process.killProcess(android.os.Process.myPid());   
    }   
  
    class ClickEvent implements View.OnClickListener {   
  
        @Override  
        public void onClick(View v) {   
            if (v == btnRecord) {   
                isRecording = true;   
                new RecordPlayThread().start();// 开一条线程边录边放   
            } else if (v == btnStop) {   
                isRecording = false;   
            } else if (v == btnExit) {   
                isRecording = false;   
                Audi.this.finish();   
            }   
        }   
    }   
  
    class RecordPlayThread extends Thread {   
        public void run() {   
            try {   
                byte[] buffer = new byte[recBufSize];   
                audioRecord.startRecording();//开始录制   
                audioTrack.play();//开始播放   
                   
                while (isRecording) {   
                    //从MIC保存数据到缓冲区   
                    int bufferReadResult = audioRecord.read(buffer, 0,   
                            recBufSize);   
  
                    byte[] tmpBuf = new byte[bufferReadResult];   
                    System.arraycopy(buffer, 0, tmpBuf, 0, bufferReadResult);   
                    //写入数据即播放   
                    audioTrack.write(tmpBuf, 0, tmpBuf.length);   
                }   
                audioTrack.stop();   
                audioRecord.stop();   
            } catch (Throwable t) {   
                Toast.makeText(Audi.this, t.getMessage(), 1000);   
            }   
        }   
    };   
}